Nevertheless, I share the question from @SDA , because I’m not sure to be able to build it for test.
Do you plan to release a version including it?
Or is there any easy way to build and deloy?
Or even introduce it in my v2.4.1?

Looking forward to your feedback! Please note that I have changed the 10ms default to 100ms. You can generate a new config file using lora-app-server -c path/to/lora-app-server.toml configfile > /path/to/new-lora-app-server.toml.

No problem, but just a quick thought: if I’m looking at it correctly, that’d involve either having to pass the app to the decode function (and thus, to other codecs too, which seems ugly) or have CustomJS hold a reference to the app or its id; or checking on the calling site for app.PayloadCodec == CustomJSType, with the added downside of timing the whole DecodeBytes call, not just the JS script running time.